Baseboard heater/wiring question

I am trying to hook this electric baseboard heater up. Its an older one that was here in ym house when i bought my place. Now my problem is there are two black wires. One black wire on top and one grayish/black wire on the bottom. I dont know which one do i connect to the black wire from the thermostat and which one do i connect to the white wire coming from the thermostat. I hope someone can help cause its buggin me badly lol

Also where in the world do i put the copper ground wire, there does not seem to be a spot to place it. Usually there is a green screw to place the ground to but there is not one here.

IF the cable came TO the baseboard and then two wires went from there to the thermostat, then it would be an SPST thermostat, which should not be used for that application, and one end connects to one of the feed wires and the other to the heater. BUT, from what the pictures show, it should be an DPST thermostat, in which case BOTH wires connect to the heater's wires, and the "green wire" attaches to the metal somewhere.